Filter media with fibrillated fibers

Abstract

Filter media suitable for various applications (e.g., hydraulic) and related components, systems, and methods associated therewith are described. The filter media may include a fiber web having a mixture of glass fibers and fibers that are fibrillated. The fibrillated fibers, for example, may be formed of lyocell.

What is claimed is: 
     
       1. A filter media comprising:
 A fiber web including glass fibers and lyocell fibers, the fiber web having a basis weight of between about 10 and 1000 g/m 2  and a thickness of between about 0.10 mm and 50.0 mm, wherein the average Canadian Standard Freeness level of fibrillation of the lyocell fibers is between about 100 and 850 and the fiber web has a dust holding capacity of greater than about 50 g/m 2 , wherein said fiber web has a mean flow pore size of between about 5 microns and about 20 microns. 
 
     
     
       2. The filter media of  claim 1 , wherein the average Canadian Standard Freeness level of fibrillation is between about 100 and about 600. 
     
     
       3. The filter media of  claim 2 , wherein the average Canadian Standard Freeness level of fibrillation is between about 200 and about 400. 
     
     
       4. The filter media of  claim 1 , wherein the lyocell fibers comprise between about 5% and about 60% by weight of the fiber web. 
     
     
       5. The filter media of  claim 4 , wherein the lyocell fibers comprise between about 5% and about 30% by weight of the fiber web. 
     
     
       6. The filter media of  claim 1 , further comprising synthetic fibers other than lyocell. 
     
     
       7. The filter media of  claim 1 , wherein the glass fibers comprise between about 40% and about 90% by weight of the fiber web. 
     
     
       8. The filter media of  claim 1 , wherein the glass fibers comprise chopped strand fibers, wherein the chopped strand fibers comprise less than about 30% by weight of the fiber web. 
     
     
       9. The filter media of  claim 1 , wherein the glass fibers comprise microglass fibers, wherein the microglass fibers comprise between about 40% and about 90% by weight of the fiber web. 
     
     
       10. The filter media of  claim 1 , wherein the fiber web has a tensile elongation in a cross-machine direction of greater than about 1% and a tensile elongation in a machine direction of greater than about 0.8%. 
     
     
       11. The filter media of  claim 1 , wherein the fiber web has a Schopper burst strength of greater than about 15 kPa. 
     
     
       12. The filter media of  claim 1 , wherein the fiber web has a tensile strength in a cross-machine direction of greater than about 3 N/15 mm and a tensile strength in a machine direction of greater than about 4 N/15 mm. 
     
     
       13. The filter media of  claim 1 , wherein the fiber web comprises a beta efficiency ratio of greater than about 100 for particles having an average diameter of greater than about 1 micron. 
     
     
       14. The filter media of  claim 1 , wherein the fiber web comprises a beta efficiency ratio of greater than about 200 for particles having an average diameter of greater than about 3 microns. 
     
     
       15. The filter media of  claim 1 , wherein the fiber web has an air permeability of between about 2 cfm/sf and about 215 cfm/sf. 
     
     
       16. The filter media of  claim 1 , wherein the fiber web comprises a beta efficiency ratio that increases or remains constant over greater than 60% of an entire test period in which the fiber web is subject to a multipass filter test. 
     
     
       17. A filter element comprising the filter media of  claim 1 . 
     
     
       18. A hydraulic filter element comprising the filter media of  claim 1 . 
     
     
       19. The filter media of  claim 1 , wherein the fiber web has a thickness of between 0.15 mm and about 50.0 mm.